[plt-scheme] possible display issues: mzscheme and emacs

Are there known issues with displaying lists from mzscheme-200 under
emacs?  I am (for example) seeing displays such as

((#0=(a b) #1=(c a b) #2=(d) a b c d e) (#0# #1# #2# f))

instead of the expected

(((a b) (c a b) (d) a b c d e) ((a b) (c a b) (d) f))

resulting from

  (define s1 '((a b) (c a b) (d)))

  (define s2 '((a b c d e) (f)))

  (map (lambda (x) (append s1 x)) s2)



This occurs under Redhat 7.3 (mzscheme-200, GNU emacs 21.2.1)
as well as under NetBSD 1.5.2 (mzscheme-200alpha19, GNU emacs
20.7.1).

I note that both drscheme, as well as mitscheme under emacs, give
the expected display.

As I wish to use emacs and mzscheme together, I'd be glad to have
advice on what to do about this.

Thanks.

--D. Troeger